feat: use creative fly instead of custom fly

src/main/java/de/mc8051/clientenhancements/client/Flying.java

@@ -1,49 +1,46 @@
 package de.mc8051.clientenhancements.client;
 
 import net.minecraft.client.MinecraftClient;
-import net.minecraft.entity.Entity;
+import net.minecraft.client.network.ClientPlayerEntity;
+import net.minecraft.entity.player.PlayerAbilities;
 import net.minecraft.util.math.Vec3d;
 
 public class Flying {
 
     int toggle = 0;
-    int MAX_SPEED = 3;
     double FALL_SPEED = -0.04;
-    double ACCELERATION = 0.1;
+
+    boolean switchedState = false;
 
     public void tick(MinecraftClient client) {
-        if (client.player != null && ClientEnhancementsClient.getKeyBindingController().getState(KeyBindingController.FLY)) {
-            boolean jumpPressed = client.options.jumpKey.isPressed();
-            boolean forwardPressed = client.options.forwardKey.isPressed();
-            boolean leftPressed = client.options.leftKey.isPressed();
-            boolean rightPressed = client.options.rightKey.isPressed();
-            boolean backPressed = client.options.backKey.isPressed();
-
-            Entity entity = client.player;
-            if (client.player.hasVehicle()) return;
-
-            final boolean anyMovement = forwardPressed || leftPressed || rightPressed || backPressed;
-            Vec3d velocity = entity.getVelocity();
-            Vec3d newVelocity = new Vec3d(velocity.x, -FALL_SPEED, velocity.z);
-            if (forwardPressed) newVelocity = client.player.getRotationVector().multiply(ACCELERATION);
-            if (leftPressed) {
-                newVelocity = client.player.getRotationVector().multiply(ACCELERATION).rotateY((float) (Math.PI / 2));
-                newVelocity = new Vec3d(newVelocity.x, 0, newVelocity.z);
-            }
-            if (rightPressed) {
-                newVelocity = client.player.getRotationVector().multiply(ACCELERATION).rotateY((float) -(Math.PI / 2));
-                newVelocity = new Vec3d(newVelocity.x, 0, newVelocity.z);
+        if (client.player != null) {
+            ClientPlayerEntity player = client.player;
+            boolean inFlyMode = player.isCreative() || player.isSpectator();
+
+            if (ClientEnhancementsClient.getKeyBindingController().getState(KeyBindingController.FLY)) {
+                if (!switchedState) switchedState = true;
+                player.getAbilities().allowFlying = true;
+
+                if (player.hasVehicle()) return;
+                if (inFlyMode) return;
+
+                final Vec3d velocity = player.getVelocity();
+                if (toggle == 0) {
+                    player.setVelocity(new Vec3d(
+                            velocity.x, FALL_SPEED - velocity.y, velocity.z
+                    ));
+                }
+
+                if (toggle == 0 || velocity.y < FALL_SPEED) toggle = 40;
+                toggle--;
+            } else if (switchedState) {
+                switchedState = false;
+                PlayerAbilities abilities = player.getAbilities();
+
+                abilities.flying = inFlyMode && !player.isOnGround();
+                abilities.allowFlying = inFlyMode;
             }
-            if (backPressed) newVelocity = client.player.getRotationVector().negate().multiply(ACCELERATION);
-            newVelocity = new Vec3d(newVelocity.x, (toggle == 0 && newVelocity.y > FALL_SPEED) ? FALL_SPEED : (anyMovement ? newVelocity.y : 0), newVelocity.z);
-            entity.setVelocity(newVelocity);
-
-            if(anyMovement) {
-                if (ACCELERATION < MAX_SPEED) ACCELERATION += 0.1;
-            } else if (ACCELERATION > 0.2) ACCELERATION -= 0.2;
 
-            if(toggle == 0 || newVelocity.y <= FALL_SPEED) toggle = 40;
-            toggle--;
         }
     }
 }